| Jurisdiction: | Diocese |
| Belfort–Montbéliard | |
| Latin: | Dioecesis Belfortiensis–Montis Beligardi |
| Local: | Diocèse de Belfort–Montbéliard |
| Country: | France |
| Province: | Besançon |
| Metropolitan: | Archdiocese of Besançon |
| Area Km2: | 1,472 |
| Population: | 325,364 |
| Population As Of: | 2012 |
| Catholics: | 247,400 |
| Catholics Percent: | 76 |
| Parishes: | 133 |
| Denomination: | Catholic Church |
| Established: | 3 November 1979 |
| Cathedral: | Cathedral Basilica of St. Christopher |
| Patron: | St. Paul |
| Bishop: | Denis Jean-Marie Jachiet |
| Bishop Title: | Bishop |
| Metro Archbishop: | Jean-Luc Bouilleret |
| Suffragan: | for one --> |
| Archdeacon: | for one--> |
| Emeritus Bishops: | Claude Pierre Charles Schockert |
| Website: | Website of the Diocese |
The Diocese of Belfort–Montbéliard (Latin: Dioecesis Belfortiensis–Montis Beligardi; French: Diocèse de Belfort–Montbéliard) is a Latin Church ecclesiastical territory or diocese of the Catholic Church in France. Erected in November 1979, the diocese was split off from the metropolitan Archdiocese of Besançon and remains a suffragan diocese in its ecclesiastical province.